31121528061 has 16 divisors (see below), whose sum is σ = 44714222784. Its totient is φ = 19140180864.

The previous prime is 31121527979. The next prime is 31121528069. The reversal of 31121528061 is 16082512113.

It is not a de Polignac number, because 31121528061 - 2¹¹ = 31121526013 is a prime.

It is a super-2 number, since 2×31121528061² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121528069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174336 + ... + 304361.

It is an arithmetic number, because the mean of its divisors is an integer number (2794638924).

Almost surely, 2^31121528061 is an apocalyptic number.

It is an amenable number.

31121528061 is a deficient number, since it is larger than the sum of its proper divisors (13592694723).

31121528061 is a wasteful number, since it uses less digits than its factorization.

31121528061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480380.

The product of its (nonzero) digits is 2880, while the sum is 30.

It can be divided in two parts, 3112152 and 8061, that added together give a palindrome (3120213).

The spelling of 31121528061 in words is "thirty-one billion, one hundred twenty-one million, five hundred twenty-eight thousand, sixty-one".